#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    int n, h, m, x;
    scanf("%d %d %d", &n, &h, &m);
    x = m / h;
    if ((m % h > 0) && (m % h < h))
    {
        x += 1;
    }
    printf("%d", n - x);
    return 0;
}